/*****************************************************************************
 *   Copyright 2005 Tim A Wang
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 ****************************************************************************/
package com.jb.web.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.activation.DataSource;

public class ByteArrayDataSource implements DataSource {
    private String type; // content-type
    private byte[] data; // data

    /* Create a DataSource from an input stream */
    public ByteArrayDataSource(InputStream is, String type) {
        this.type = type;

        try {
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            int ch;

            while ((ch = is.read()) != -1) {
                // XXX - must be made more efficient by
                // doing buffered reads, rather than one byte reads
                os.write(ch);
            }

            data = os.toByteArray();
        } catch (IOException ioex) {
        }
    }

    /* Create a DataSource from a byte array */
    public ByteArrayDataSource(byte[] data, String type) {
        this.data = data;
        this.type = type;
    }

    /* Create a DataSource from a String */
    public ByteArrayDataSource(String data, String type) {
        try {
            // Assumption that the string contains only ASCII
            // characters!  Otherwise just pass a charset into this
            // constructor and use it in getBytes()
            this.data = data.getBytes("iso-8859-1");
        } catch (UnsupportedEncodingException uex) {
        }

        this.type = type;
    }

    public String getContentType() {
        return type;
    }

    /**
     * Return an InputStream for the data.
     * Note - a new stream must be returned each time.
     */
    public InputStream getInputStream() throws IOException {
        if (data == null) {
            throw new IOException("no data");
        }

        return new ByteArrayInputStream(data);
    }

    public String getName() {
        return "dummy";
    }

    public OutputStream getOutputStream() throws IOException {
        throw new IOException("cannot do this");
    }
}
